car travels from a to B with a speed of 40 kilometre per hour and returns back with a speed of 50 km per hour find its average speed over the journey
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Let n be the distance between a and b. Then the total time taken would be:
t=n/40 + n/50
The total distance is 2n. So, the average speed is distance over time. Thus:
V=2n / n/40 + n/50
=400n/ 5n+4n
=400/9
=44.44444 km/h average speed
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